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Subject[PATCH net-next 2/2] bridge: implement get_link_ksettings ethtool method
Date
We return the maximum speed of all active ports. This matches how the link
speed would give an upper limit for traffic to/from any single peer if the
bridge were replaced with a hardware switch.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
---
net/bridge/br_device.c | 37 +++++++++++++++++++++++++++++++++++--
1 file changed, 35 insertions(+), 2 deletions(-)

diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index e804a3016902..e8a2d0c13592 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -263,6 +263,38 @@ static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
}

+static int br_get_link_ksettings(struct net_device *dev,
+ struct ethtool_link_ksettings *cmd)
+{
+ struct net_bridge *br = netdev_priv(dev);
+ struct net_bridge_port *p;
+
+ cmd->base.duplex = DUPLEX_UNKNOWN;
+ cmd->base.port = PORT_OTHER;
+ cmd->base.speed = SPEED_UNKNOWN;
+
+ list_for_each_entry(p, &br->port_list, list) {
+ struct ethtool_link_ksettings ecmd;
+ struct net_device *pdev = p->dev;
+
+ if (!netif_running(pdev) || !netif_oper_up(pdev))
+ continue;
+
+ if (__ethtool_get_link_ksettings(pdev, &ecmd))
+ continue;
+
+ if (ecmd.base.speed == (__u32)SPEED_UNKNOWN)
+ continue;
+
+ if (cmd->base.speed == (__u32)SPEED_UNKNOWN ||
+ cmd->base.speed < ecmd.base.speed) {
+ cmd->base.speed = ecmd.base.speed;
+ }
+ }
+
+ return 0;
+}
+
static netdev_features_t br_fix_features(struct net_device *dev,
netdev_features_t features)
{
@@ -365,8 +397,9 @@ static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
}

static const struct ethtool_ops br_ethtool_ops = {
- .get_drvinfo = br_getinfo,
- .get_link = ethtool_op_get_link,
+ .get_drvinfo = br_getinfo,
+ .get_link = ethtool_op_get_link,
+ .get_link_ksettings = br_get_link_ksettings,
};

static const struct net_device_ops br_netdev_ops = {
--
2.24.0
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